The invention discloses a three-phase switch reluctance motor four-quadrant no-position-sensor control method, and belongs to the technical field of motor driving. The method is characterized in by comprising the steps: actually measuring each phase magnetic flux linkage of a switch reluctance motor by using a testing circuit; according to four magnetic flux linkage-current characteristic curves of a special rotor position, namely a magnetic flux linkage-current characteristic curve phi (theta /6) of a theta /6 rotor position, a magnetic flux linkage-current characteristic curve phi (theta /3) of a theta /3 rotor position, a magnetic flux linkage-current characteristic curve phi (2theta /3) of a 2theta /3 rotor position, a magnetic flux linkage-current characteristic curve phi (5theta /6) of a 5theta /6 rotor position, determining the rotor position; sequentially switching on and switching off each phase; and implementing forward and backward start-up, low-speed forward power-on and braking operation, low-speed backward power-on and braking operation, middle/high-speed forward power-in and braking operation, middle/high-speed backward power-on and braking operation. According to the three-phase switch reluctance motor four-quadrant no-position-sensor control method, no rotor position sensor is provided, three-phase switch reluctance motor four-quadrant control is achieved, and engineering application value is excellent.